add safeguard

app/models/medical_release.rb

@@ -82,7 +82,7 @@ class MedicalRelease < ApplicationRecord
 
   def valid_answers
     (1..ContractTemplate::NUMBER_OF_CUSTOM_FIELDS).each do |index|
-      if contract_template["question_#{index}_text"].present? &&
+      if contract_template && contract_template["question_#{index}_text"].present? &&
          public_send("question_#{index}_answer").blank?
         errors.add("question_#{index}", I18n.t('medical_releases.custom_validation_errors.question_answer_is_required'))
       end